Hi, it appears to be some kind of android "feauture" on OLED Devices to prevent burn in of the navbar icons. Someone on Reddit managed to turn it off with root. Besides that it's well... Just a "feature". (htt ps://www.reddit.com/r/SonyXperia/comments/bzy2z3/off_center_navigation_bar_xz3/eqycw2n?utm_medium=android_app&utm_source=share)
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